Pandas expand rows from list data available in column

DataFrame.explode

Since pandas >= 0.25.0 we have the explode method for this, which expands a list to a row for each element and repeats the rest of the columns:

df.explode('column1').reset_index(drop=True)

Output

  column1  column2
0       a        1
1       b        1
2       c        1
3       d        2
4       e        2
5       f        2
6       g        3
7       h        3
8       i        3

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Since pandas >= 1.1.0 we have the ignore_index argument, so we don’t have to chain with reset_index:

df.explode('column1', ignore_index=True)

Output

  column1  column2
0       a        1
1       b        1
2       c        1
3       d        2
4       e        2
5       f        2
6       g        3
7       h        3
8       i        3